Expansive pyramid examples?

• A. Nigeria, Niger, Afghanistan, sub-Saharan Africa, low GDP nations
• B. USA, Canada, Australia
• C. Japan, Germany
• D. Canada, Norway

Answer: (A)

An expansive population pyramid shows high birth rates and a young population, creating a wide base that tapers quickly as age increases. This shape is typical of many developing or low-income nations where fertility remains high and a large share of people are children and young adults.

The set that includes Nigeria, Niger, Afghanistan, sub-Saharan Africa, and other low GDP nations fits this pattern best. These regions commonly have high fertility rates and rapid population growth, producing the broad bottom and rapid overall growth characteristic of expansive pyramids.

In contrast, developed regions like the USA, Canada, and Australia; and the aging societies such as Japan, Germany, and Norway, tend to have lower birth rates and older populations, producing more rectangular or constricted pyramids rather than expansive ones.